Molecular inference, multivariate morphometrics and ecological assessment are applied in concert to delimit species in the Russula clavipes complex

Species of Russula subsect. Xerampelinae are notoriously difficult to identify and name and have not been subject to molecular study. A group of species, referred to here as the R. clavipes complex, growing in association with Salix, Betula and Populus as well as coniferous tree species from tempera...

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Bibliographic Details
Published in:Mycologia
Main Authors: Adamcik, Slavomir, Eberhardt, Ursula, Ronikier, Anna, Jairus, Teele, Slovák, Marek, Hampe, Felix, Verbeken, Annemieke
Format: Article in Journal/Newspaper
Language:English
Published: 2016
Subjects:
Biology and Life Sciences
DNA barcode
ectomycorrhizal fungi
Europe
haplotype analysis
Russula nuoljae
R. pascua
INTERNAL TRANSCRIBED SPACER
MULTIPLE SEQUENCE ALIGNMENT
PHYLOGENETIC-RELATIONSHIPS
HAPLOTYPE RECONSTRUCTION
XERAMPELINA GROUP
UNITED-STATES
RDNA REGION
FUNGI
DNA
IDENTIFICATION
Arctic
Online Access:https://biblio.ugent.be/publication/7225256
http://hdl.handle.net/1854/LU-7225256
https://doi.org/10.3852/15-194
https://biblio.ugent.be/publication/7225256/file/7228211
Description
Summary:Species of Russula subsect. Xerampelinae are notoriously difficult to identify and name and have not been subject to molecular study. A group of species, referred to here as the R. clavipes complex, growing in association with Salix, Betula and Populus as well as coniferous tree species from temperate to arctic and alpine habitats, were examined. Analyses of the nuc rDNA internal transcribed spacer (ITS) region and a numerical analysis of morphological characters were used. The R. clavipes complex is a monophyletic group within Russula subsect. Xerampelinae, according to molecular results. The complex includes three species: R nuoljae is a phylogenetically and morphologically well-supported species while the other two, R clavipes and R pascua, are similar based on ITS data and morphology but separate based on their ecology. Russula pseudoolivascens is conspecific with R clavipes. Several combinations of characters traditionally used in the taxonomy of R subsect. Xerampelinae are inappropriate for species delimitation in this group and the adequacy of the ITS for species identification in this group is discussed. Detailed microscopic observations on the type collection of R nuoljae are presented and illustrated, along with a key to the European members of R. subsect. Xerampelinae.

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